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The protocol that underlies the World Wide Web, HTTP, does not have a facility for tracking things from one visit to another, so an extension was rigged up to allow it to maintain such state across HTTP requests and responses The mechanism, described in RFC 2109 (http://wwww3org/Protocols/rfc2109/rfc2109), sets cookies, or special tokens contained within HTTP requests and responses, that allow websites to remember who you are from visit to visit Cookies can be set per session, in which case they remain in volatile memory and expire either when the browser is closed or according to a set expiration time Or they can be persistent, residing as a text file on the user s hard drive, usually in a folder called Cookies (This is typically %windir%\Cookies under Win9x or %userprofile%\Cookies under NT family systems like Windows 2000 and XP or c:\users\<username>\AppData\ Roaming\Microsoft\Windows\Cookies for Windows Vista but remember to set Explorer to show hidden files or you won t see the Cookies directory) As you might imagine, attackers who can lay their hands on your cookies might be able to spoof your online identity or glean sensitive information The brute-force way to hijack cookies is to sniff them off the network and then replay them to the server As we noted in the previous section, another more devious way is to trick the user or to exploit a security vulnerability in the user s Internet client, and then execute a client-side script that reads cookies and sends them back to a malicious server In the upcoming section on cross-site scripting (XSS), we ll present an example of how a software vulnerability can be used to steal a user s cookie with little or no interaction
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Be wary of sites that use cookies for authentication and storage of sensitive personal data There are numerous tools available today that can manage cookies on your system (try searching http://wwwdownloadcom for the term cookie and sort by number of recent downloads to see the most popular utilities of this sort) In general, these tools enable you to see what s going on behind the scenes so you can decide whether you want to allow such activity Microsoft s Internet Explorer has a built-in cookie-screening feature, available under the Security tab of the Internet Options control panel: Internet Zone | Custom Level | Prompt for persistent and per-session cookies In IE6 and later, more advanced cookie-screening options can be set under the Internet Options control panel s Privacy tab Netscape browser cookie behavior is set via Edit | Preferences | Advanced and checking either Warn Me Before Accepting a Cookie or Disable Cookies For those cookies that you do accept, check them out if they are written to disk and see whether the site is storing any personal information about you Also remember, if you visit a site that uses cookies for authentication, it should at least use SSL to encrypt the initial post of your username and password so that it doesn t just show up as plaintext on the wire You should also verify that the site does not use the HTTP GET method to accept your credentials, because this could expose sensitive usernames and passwords without encryption in the return query string (which is potentially visible both in transit and in the web server logs and who knows who has access to those!) We d prefer to disable cookies outright, but many of the sites we frequent often require them to be enabled For example, Microsoft s wildly popular Hotmail service requires cookies to be enabled in order to log in Because Hotmail rotates among various authentication servers, it isn t easy just to add Hotmail to the Trusted Sites zone under Internet Options You could use the *hotmailcom wildcard notation to help out here Cookies are an imperfect solution to inadequacies in HTTP, but the alternatives are probably much worse (for example, appending an identifier to URLs that may be stored on proxies) Until someone comes up with a better idea, monitoring cookies using the tools referenced earlier is the only solution
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XSS gained its current name and a lot of visibility circa 2001 when exploits began to truly proliferate as an effective vehicle for online scams As we discussed in 11, XSS results from a flaw in the design of a web server based application Nevertheless, XSS typically requires the complicity of the end user in formulating an end-to-end exploit, which is why we bring it up in our discussion of client-side hacking in this chapter XSS typically results from a web application that takes input from one user (or set of users) and displays it to another user (or set of users) By carefully crafting input, malicious users can get code to execute on the machines of other hapless users For example, the following code, whether activated from a malicious website or HTML
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